Steam pressure cooker



Dec. 1, 1931. T HASHlMOT'Q 1,834,837

STEAM PRESSURE COOKER 0 inaljEiled Sept. 19, 1928 TEL/4&2 f/cZsFazLmoZaPatented Dec. 1 1931 TAKICHI EASHIM'OTO, OF KAMIAKURA-GHO, KANAGAWA,JAPAN STEAM PRESSURE COOKER Original application flied September 19,1928, Serial No. 806,996. Divided and this application filed August 29,1930. Serial No. 478,767.

This application is a division of application No. 306,996 filedSeptember 19th, 1928, upon which'Patent No. 1,765,072, has been granted.

This invention'relates to the improvements in steam-pressure cookers andhas for its object a cooker having an outlet for steam which opensautomatically by a predetermined steam pressure. The construction of myinvention consists mainly of the following parts to wit; firstly, a lidhaving a cylinder (hereinafter called lid-cylinder) fixed at its centrethrough which it projects outside and has two holes or exhaust openingsand a groove, the latter of which made partly horizontal, partlyvertical and both in a contiguous line, and secondly a handle of the lid(hereinafter called lid handle) consisting of a knob and cylinder fixedtogether with a piece of ebonite between them, of which the former has aweight inside and the latter has a projecting point inside so that whenthe knob is turned till the projected point engages or fits into thehorizontal part, of the lidcylinder, both cylinders are formed into onebody with the lid-cylinder and when it is so turned as to engage, or fitinto the vertical part, the openings or holes of the lid-cylinder becomefree or exposed, thus serving as a safety-valve or exhaust-passage ofsteam.

The annexed drawings illustrate an example of the application of myinvention.

Fig. 1 is the front view of the cooker. Fig. 2 is a front view of thelid-handle showing its upper part cut away, Fig. 3 is the front view ofthe lid-handle and the dotted line shows its position when forced up bysteam pressure.

To describein detail the construction of the cooker, the lid 1 has atits centre a straight lid cylinder 2 projecting outside which has aroundand outside a curved groove or channel 7 and also hole or holes 3 forsteam to escape. a The said cylinder 2 is so made as to form one bodywith the cylinder 4 of the lidhandle when both are fitted between thetop of the lid-cylinder, and beneath the knob, a piece of ebonite 5 orother non-conductible material is fitted. Inthe hollow of the knob,cement or similar materials 6 are filled for the purpose of a weight sothat so long as the steam when it is high enough to overcome the steampressure of the cooker does not exceed a certain degree the lid-handleis prevented from being pushed up or lifted. The curved groove 7 of thelid cylinder is made of two parts, horizontal 7 and vertical 7 to bothof which a small projecting point 8 inside the cylinder part oflid-handle is made to fit. in such a way that when the said point 8 isin the horizontal section '7' of the groove 7 the lid-cylinder becomesas one body with the lid itself and when the handle is so turned as tofit the point 8 into the vertical groove'7 and left in that position asshown in Fig. 3 the lid-handle is forced up by pressure of theresistance of weight contained in the knob part of the handle. With theforcing up of the lid-handle as described by dotted line in Fig. 3,steam hole or holes 3 become exposed and the steam is allowed to escape,thereby serving as a safety-valve. The method of using thesteam-pressure cooker of my invention is to tightly close the body ofthe cooker with the lid by the action of the body-handles 9, to turn thelid-handle by the knob in such a way that the projection in its cylinderpart should fit into the perpendicular section-of the groove in thelid-cylinder, and to boil or steam food or other material in a usualway.

The peculiar advantage of this cooker lies'in the fact that the pressureof steam in the vessel is kept under a predetermined degree and thatWhenever the pressure exceed the said degree, the lid-handleautomatically works as a safety-valve.

Having thus described my invention, what I claim is:

1. A cooker comprising a body, a lid therefor having a tubular extensionproviding an outlet to the atmosphere for said cooker, said extensionhaving a lateral opening adjacent to its lower end, a weighted knobhaving a tubular extension adapted for telescoping over the tubularextension of the lid, and co-opcrative groove and pin means whereby theknob hasfree upward movement to permit uncovering the lateral opening insaid extension for said lid and whereb said weighted knob may beinterlocked with the tubular extensionof the lid, to prevent ver- :15signature.

tical movement of the weighted knob, when desired.

2. A cooker comprising a. body, a lid therefor, means for clamping thelid against bea ing lifted from the cooker body, a weighted handle forthe lid, and co-operative means between the lid and weighted handlewhere- 'by a predetermined steam pressure within the cooker will liftthe weighted handle and open an outlet from thecooker to the atmosphereand meanswhereby the weighted handle and the lid may be interlockedagainst movement of the former relatively to the lid. In testimonywhereof I have aflixed my TAKICHI HASHIMOTO.

